fix: remove extra closing paren in LDAP filter

instruct/handlers.py

@@ -50,7 +50,7 @@ def _get_user_cn(user_id: str) -> str:
             f"(mail={search_id})"
             f"(userPrincipalName={search_id})"
             f"(userPrincipalName={short_username}@sibcem.ru))"
-            f"(sAMAccountName={safe_sam})))"
+            f"(sAMAccountName={safe_sam}))"
         )
         logger.info(f"AD filter: {search_filter}")